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Proceedings Paper

Stabilized And Accelerated Speckle Strain Gauge
Author(s): Ichirou Yamaguchi; Tamiki Takemori; Koichi Kobayashi
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Paper Abstract

We have improved stability and temporal response of the laser speckle strain gauge. In the gauge a narrow laser beam is incident on a diffuse surface and speckle patterns appearing in the light scattered to certain directions are detected by linear image sensors. The correlator computes the correlation peak between the current frame and a reference one of the sensor which is driven at 1000 frames per second. The reference frame is fixed until the correlation peak becomes lower than a threshold. By employing a pair of the correlators and a laser of output power of a few tens of mW, we could measure dynamic strain of polymer films, between a fraction of Hertz and one hundred Hertz. The resolution of the gauge which only depends on geometry of the optical system and the sensor pitch, is a few tens of microstrains. The upper limit of the measurement can be extended arbitrarily much because small incremental strain is integrated.

Paper Details

Date Published: 25 April 1990
PDF: 14 pages
Proc. SPIE 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series, (25 April 1990); doi: 10.1117/12.962746
Show Author Affiliations
Ichirou Yamaguchi, The Institute of Physical and Chemical Research (Japan)
Tamiki Takemori, Hamamatsu Photonics K.K. (Japan)
Koichi Kobayashi, Toyo Seiki Co. (Japan)

Published in SPIE Proceedings Vol. 1162:
Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series
Ryszard J. Pryputniewicz, Editor(s)

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